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      1 // Copyright 2013 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "src/hydrogen-infer-types.h"
      6 
      7 namespace v8 {
      8 namespace internal {
      9 
     10 void HInferTypesPhase::InferTypes(int from_inclusive, int to_inclusive) {
     11   for (int i = from_inclusive; i <= to_inclusive; ++i) {
     12     HBasicBlock* block = graph()->blocks()->at(i);
     13 
     14     const ZoneList<HPhi*>* phis = block->phis();
     15     for (int j = 0; j < phis->length(); j++) {
     16       phis->at(j)->UpdateInferredType();
     17     }
     18 
     19     for (HInstructionIterator it(block); !it.Done(); it.Advance()) {
     20       it.Current()->UpdateInferredType();
     21     }
     22 
     23     if (block->IsLoopHeader()) {
     24       HBasicBlock* last_back_edge =
     25           block->loop_information()->GetLastBackEdge();
     26       InferTypes(i + 1, last_back_edge->block_id());
     27       // Skip all blocks already processed by the recursive call.
     28       i = last_back_edge->block_id();
     29       // Update phis of the loop header now after the whole loop body is
     30       // guaranteed to be processed.
     31       for (int j = 0; j < block->phis()->length(); ++j) {
     32         HPhi* phi = block->phis()->at(j);
     33         worklist_.Add(phi, zone());
     34         in_worklist_.Add(phi->id());
     35       }
     36       while (!worklist_.is_empty()) {
     37         HValue* current = worklist_.RemoveLast();
     38         in_worklist_.Remove(current->id());
     39         if (current->UpdateInferredType()) {
     40           for (HUseIterator it(current->uses()); !it.Done(); it.Advance()) {
     41             HValue* use = it.value();
     42             if (!in_worklist_.Contains(use->id())) {
     43               in_worklist_.Add(use->id());
     44               worklist_.Add(use, zone());
     45             }
     46           }
     47         }
     48       }
     49       DCHECK(in_worklist_.IsEmpty());
     50     }
     51   }
     52 }
     53 
     54 } }  // namespace v8::internal
     55